Improvement in packing for stuffing-boxes



To all whom it may concern tllnitt t alm strut one.

WILLIAM W. ALLMAND, OF EAST BOSTON, MASSACHUSETTS.

Letters Patent No. 97,585, dated December 7, 1869.

IMPROVEMENT IN PACKING- FOR STUI'PING-BQXES.

The Schedule referred to in these Letters Patent and making part of the same.

Be it known that I, WILLIAM W. ALL-HAND, of East Boston, in the county of Suffolk, and inthe State of Massachusetts, have invented a certain new and useful Improvement in Compositions for Smiling-Box Packing; and do hereby declare that the following is a full, clear,'and exact description thereof.

My invention relates to a class of compositions containing rubber, employed for packing stuffing-boxes; and

It-consists in the employment of a ring of hard wood,

or its equivalent, between the composition andthe rod,

whereby all injury to the packing from heat is avoided,

- audits elasticity remains unimpaired.

' By reason of its great elasticity, rubber is largely used for striding-box packing; but, in its pure state,

or when mixed with other ingredients, it is open to serious objections, as the action of heat not only destroys its elasticity, but also renders itliable to adhere to the box and rod. I

In order to overcome this objection, I make use of a thin shell or ring of hard wood, (preferably lignunivitae) placed next to the rod, with the rubber or composition placed upon the outside of the same, and then vulcanized within a cylinder corresponding in size and.

' through its centre shape with the stufling-bomits ends being closed by means of suitable heads, while an arbor or mandrel, corresponding in size and shape to the, rod passes or axis. When taken from the cylinder, the packing is placed within a lathe and cut into rings of the desired size, afterwhich it is ready for use.

The wood being a non-comluotor of heat, prevents injury to the rubber, and, at the same time, from its action upon the rod, renders the use of lubricators unand desire to secure by Let- VVit-nesses:

I. E. TILLINGHAS'I, GrEov O. GATES. 

